Run results for: Object.assign vs. JSON String/Parse with large-ish data

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36

Browser: Chrome 67

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
Spread operator	103603.9 Ops/sec
JSON Parse	106378.0 Ops/sec
Object.assign	106241.0 Ops/sec

Tests:

Spread operator
var n = {"odds_change":{"product":"1","event_id":"sr:match:15110315","timestamp":"1532518144747","sport_event_status":{"id":1,"description":"1st period","period_number":"1"},"odds":{"market":[{"status":"0","id":"190","specifiers":"total=7.5","name":"Bukta, Agnes total games","groups":"all"},{"status":"0","id":"191","specifiers":"total=14.5","name":"Galfi, Dalma total games","groups":"all"},{"favourite":"1","status":"1","id":"198","outcome":[{"id":"70","odds":"2.0","active":"1","name":"odd"},{"id":"72","odds":"1.65","active":"1","name":"even"}],"name":"Odd/even games","groups":"all"},{"favourite":"1","status":"1","id":"199","specifiers":"variant=sr:correct_score:bestof:3","outcome":[{"id":"sr:correct_score:bestof:3:4","active":"0","name":"2:0"},{"id":"sr:correct_score:bestof:3:5","odds":"14.5","active":"1","name":"2:1"},{"id":"sr:correct_score:bestof:3:6","odds":"7.75","active":"1","name":"1:2"},{"id":"sr:correct_score:bestof:3:7","odds":"1.1","active":"1","name":"0:2"}],"name":"Correct score","groups":""},{"favourite":"1","status":"1","id":"192","outcome":[{"id":"74","odds":"5.25","active":"1","name":"yes"},{"id":"76","odds":"1.09","active":"1","name":"no"}],"name":"Bukta, Agnes to win a set","groups":"all"},{"status":"0","id":"191","specifiers":"total=13.5","name":"Galfi, Dalma total games","groups":"all"},{"status":"1","id":"189","specifiers":"total=21.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 21.5"},{"id":"12","odds":"2.3","active":"1","name":"over 21.5"}],"name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"191","specifiers":"total=12.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 12.5"},{"id":"12","odds":"2.35","active":"1","name":"over 12.5"}],"name":"Galfi, Dalma total games","groups":"all"},{"status":"1","id":"190","specifiers":"total=9.5","outcome":[{"id":"13","odds":"1.22","active":"1","name":"under 9.5"},{"id":"12","odds":"3.35","active":"1","name":"over 9.5"}],"name":"Bukta, Agnes total games","groups":"all"},{"favourite":"1","status":"1","id":"195","outcome":[{"id":"74","odds":"3.95","active":"1","name":"yes"},{"id":"76","odds":"1.16","active":"1","name":"no"}],"name":"Will there be a tiebreak","groups":"all"},{"favourite":"1","status":"1","id":"189","specifiers":"total=20.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 20.5"},{"id":"12","odds":"2.3","active":"1","name":"over 20.5"}],"name":"Total games","groups":"all"},{"status":"0","id":"204","specifiers":"setnr=2|total=12.5","name":"2 set - total games","groups":"all"},{"favourite":"1","status":"1","id":"190","specifiers":"total=8.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 8.5"},{"id":"12","odds":"2.3","active":"1","name":"over 8.5"}],"name":"Bukta, Agnes total games","groups":"all"},{"favourite":"1","status":"1","id":"206","specifiers":"setnr=2","outcome":[{"id":"74","odds":"4.05","active":"1","name":"yes"},{"id":"76","odds":"1.16","active":"1","name":"no"}],"name":"2 set - will there be a tiebreak","groups":"all"},{"favourite":"1","status":"0","id":"187","specifiers":"hcp=4.5","name":"Game handicap","groups":"all"},{"favourite":"1","status":"1","id":"186","outcome":[{"id":"4","odds":"8.0","active":"1","name":"Bukta, Agnes"},{"id":"5","odds":"1.02","active":"1","name":"Galfi, Dalma"}],"name":"Winner","groups":"all"},{"favourite":"1","status":"0","id":"203","specifiers":"setnr=2|hcp=2.5","name":"2 set - game handicap","groups":"all"},{"status":"0","id":"187","specifiers":"hcp=3.5","name":"Game handicap","groups":"all"},{"status":"0","id":"204","specifiers":"setnr=2|total=9.5","name":"2 set - total games","groups":"all"},{"status":"1","id":"203","specifiers":"setnr=2|hcp=1.5","outcome":[{"id":"1714","odds":"3.35","active":"1","name":"Bukta, Agnes (1.5)"},{"id":"1715","odds":"1.22","active":"1","name":"Galfi, Dalma (1.5)"}],"name":"2 set - game handicap","groups":"all"},{"status":"0","id":"189","specifiers":"total=22.5","name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"204","specifiers":"setnr=2|total=10.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 10.5"},{"id":"12","odds":"2.3","active":"1","name":"over 10.5"}],"name":"2 set - total games","groups":"all"},{"status":"0","id":"187","specifiers":"hcp=2.5","name":"Game handicap","groups":"all"},{"status":"0","id":"189","specifiers":"total=19.5","name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"205","specifiers":"setnr=2","outcome":[{"id":"70","odds":"1.95","active":"1","name":"odd"},{"id":"72","odds":"1.65","active":"1","name":"even"}],"name":"2 set - odd/even games","groups":"all"},{"favourite":"1","status":"1","id":"202","specifiers":"setnr=2","outcome":[{"id":"4","odds":"5.25","active":"1","name":"Bukta, Agnes"},{"id":"5","odds":"1.09","active":"1","name":"Galfi, Dalma"}],"name":"2 set - winner","groups":"all"},{"favourite":"1","status":"0","id":"207","specifiers":"setnr=2","name":"2 set - correct score","groups":"all"},{"status":"0","id":"203","specifiers":"setnr=2|hcp=-1.5","name":"2 set - game handicap","groups":"all"}]},"event_fixture":{"_id":"5b572441a7198eb494400815","id":"sr:match:15110315","scheduled":"2018-07-25T10:00:00.000Z","start_time_tbd":false,"status":"live","next_live_time":"2018-07-25T10:10:00.000Z","liveodds":"booked","tournament_round":{"betradar_id":"72404","type":"cup","name":"round_of_16"},"season":{"id":"sr:season:55667","name":"2018 ITF Hungary 07A, Women Singles","start_date":"2018-07-22","end_date":"2018-07-28","year":"2018","tournament_id":"sr:tournament:18282"},"tournament":{"id":"sr:tournament:18282","name":"ITF Hungary 07A, Women Singles","sport":{"id":"sr:sport:5","name":"Tennis"},"category":{"id":"sr:category:213","name":"ITF Women"}},"competitors":{"competitor":[{"id":"sr:competitor:66216","name":"Bukta, Agnes","country":"Hungary","country_code":"HUN","abbreviation":"BUK","qualifier":"home","reference_ids":{"reference_id":{"name":"betradar","value":"5783335"}}},{"id":"sr:competitor:97995","name":"Galfi, Dalma","country":"Hungary","country_code":"HUN","abbreviation":"GAL","qualifier":"away","reference_ids":{"reference_id":{"name":"betradar","value":"6642590"}}}]},"venue":{"id":"sr:venue:31749","name":"Court 6","city_name":"Baja","country_name":"Hungary","country_code":"HUN"},"expireAt":"2018-07-26T10:00:00.000Z"}}} while(n.length < 1000) { n = [...n]; }
JSON Parse
var n = {"odds_change":{"product":"1","event_id":"sr:match:15110315","timestamp":"1532518144747","sport_event_status":{"id":1,"description":"1st period","period_number":"1"},"odds":{"market":[{"status":"0","id":"190","specifiers":"total=7.5","name":"Bukta, Agnes total games","groups":"all"},{"status":"0","id":"191","specifiers":"total=14.5","name":"Galfi, Dalma total games","groups":"all"},{"favourite":"1","status":"1","id":"198","outcome":[{"id":"70","odds":"2.0","active":"1","name":"odd"},{"id":"72","odds":"1.65","active":"1","name":"even"}],"name":"Odd/even games","groups":"all"},{"favourite":"1","status":"1","id":"199","specifiers":"variant=sr:correct_score:bestof:3","outcome":[{"id":"sr:correct_score:bestof:3:4","active":"0","name":"2:0"},{"id":"sr:correct_score:bestof:3:5","odds":"14.5","active":"1","name":"2:1"},{"id":"sr:correct_score:bestof:3:6","odds":"7.75","active":"1","name":"1:2"},{"id":"sr:correct_score:bestof:3:7","odds":"1.1","active":"1","name":"0:2"}],"name":"Correct score","groups":""},{"favourite":"1","status":"1","id":"192","outcome":[{"id":"74","odds":"5.25","active":"1","name":"yes"},{"id":"76","odds":"1.09","active":"1","name":"no"}],"name":"Bukta, Agnes to win a set","groups":"all"},{"status":"0","id":"191","specifiers":"total=13.5","name":"Galfi, Dalma total games","groups":"all"},{"status":"1","id":"189","specifiers":"total=21.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 21.5"},{"id":"12","odds":"2.3","active":"1","name":"over 21.5"}],"name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"191","specifiers":"total=12.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 12.5"},{"id":"12","odds":"2.35","active":"1","name":"over 12.5"}],"name":"Galfi, Dalma total games","groups":"all"},{"status":"1","id":"190","specifiers":"total=9.5","outcome":[{"id":"13","odds":"1.22","active":"1","name":"under 9.5"},{"id":"12","odds":"3.35","active":"1","name":"over 9.5"}],"name":"Bukta, Agnes total games","groups":"all"},{"favourite":"1","status":"1","id":"195","outcome":[{"id":"74","odds":"3.95","active":"1","name":"yes"},{"id":"76","odds":"1.16","active":"1","name":"no"}],"name":"Will there be a tiebreak","groups":"all"},{"favourite":"1","status":"1","id":"189","specifiers":"total=20.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 20.5"},{"id":"12","odds":"2.3","active":"1","name":"over 20.5"}],"name":"Total games","groups":"all"},{"status":"0","id":"204","specifiers":"setnr=2|total=12.5","name":"2 set - total games","groups":"all"},{"favourite":"1","status":"1","id":"190","specifiers":"total=8.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 8.5"},{"id":"12","odds":"2.3","active":"1","name":"over 8.5"}],"name":"Bukta, Agnes total games","groups":"all"},{"favourite":"1","status":"1","id":"206","specifiers":"setnr=2","outcome":[{"id":"74","odds":"4.05","active":"1","name":"yes"},{"id":"76","odds":"1.16","active":"1","name":"no"}],"name":"2 set - will there be a tiebreak","groups":"all"},{"favourite":"1","status":"0","id":"187","specifiers":"hcp=4.5","name":"Game handicap","groups":"all"},{"favourite":"1","status":"1","id":"186","outcome":[{"id":"4","odds":"8.0","active":"1","name":"Bukta, Agnes"},{"id":"5","odds":"1.02","active":"1","name":"Galfi, Dalma"}],"name":"Winner","groups":"all"},{"favourite":"1","status":"0","id":"203","specifiers":"setnr=2|hcp=2.5","name":"2 set - game handicap","groups":"all"},{"status":"0","id":"187","specifiers":"hcp=3.5","name":"Game handicap","groups":"all"},{"status":"0","id":"204","specifiers":"setnr=2|total=9.5","name":"2 set - total games","groups":"all"},{"status":"1","id":"203","specifiers":"setnr=2|hcp=1.5","outcome":[{"id":"1714","odds":"3.35","active":"1","name":"Bukta, Agnes (1.5)"},{"id":"1715","odds":"1.22","active":"1","name":"Galfi, Dalma (1.5)"}],"name":"2 set - game handicap","groups":"all"},{"status":"0","id":"189","specifiers":"total=22.5","name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"204","specifiers":"setnr=2|total=10.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 10.5"},{"id":"12","odds":"2.3","active":"1","name":"over 10.5"}],"name":"2 set - total games","groups":"all"},{"status":"0","id":"187","specifiers":"hcp=2.5","name":"Game handicap","groups":"all"},{"status":"0","id":"189","specifiers":"total=19.5","name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"205","specifiers":"setnr=2","outcome":[{"id":"70","odds":"1.95","active":"1","name":"odd"},{"id":"72","odds":"1.65","active":"1","name":"even"}],"name":"2 set - odd/even games","groups":"all"},{"favourite":"1","status":"1","id":"202","specifiers":"setnr=2","outcome":[{"id":"4","odds":"5.25","active":"1","name":"Bukta, Agnes"},{"id":"5","odds":"1.09","active":"1","name":"Galfi, Dalma"}],"name":"2 set - winner","groups":"all"},{"favourite":"1","status":"0","id":"207","specifiers":"setnr=2","name":"2 set - correct score","groups":"all"},{"status":"0","id":"203","specifiers":"setnr=2|hcp=-1.5","name":"2 set - game handicap","groups":"all"}]},"event_fixture":{"_id":"5b572441a7198eb494400815","id":"sr:match:15110315","scheduled":"2018-07-25T10:00:00.000Z","start_time_tbd":false,"status":"live","next_live_time":"2018-07-25T10:10:00.000Z","liveodds":"booked","tournament_round":{"betradar_id":"72404","type":"cup","name":"round_of_16"},"season":{"id":"sr:season:55667","name":"2018 ITF Hungary 07A, Women Singles","start_date":"2018-07-22","end_date":"2018-07-28","year":"2018","tournament_id":"sr:tournament:18282"},"tournament":{"id":"sr:tournament:18282","name":"ITF Hungary 07A, Women Singles","sport":{"id":"sr:sport:5","name":"Tennis"},"category":{"id":"sr:category:213","name":"ITF Women"}},"competitors":{"competitor":[{"id":"sr:competitor:66216","name":"Bukta, Agnes","country":"Hungary","country_code":"HUN","abbreviation":"BUK","qualifier":"home","reference_ids":{"reference_id":{"name":"betradar","value":"5783335"}}},{"id":"sr:competitor:97995","name":"Galfi, Dalma","country":"Hungary","country_code":"HUN","abbreviation":"GAL","qualifier":"away","reference_ids":{"reference_id":{"name":"betradar","value":"6642590"}}}]},"venue":{"id":"sr:venue:31749","name":"Court 6","city_name":"Baja","country_name":"Hungary","country_code":"HUN"},"expireAt":"2018-07-26T10:00:00.000Z"}}} while(n.length < 1000) { n = JSON.parse(JSON.stringify(n)) }
Object.assign
var n = {"odds_change":{"product":"1","event_id":"sr:match:15110315","timestamp":"1532518144747","sport_event_status":{"id":1,"description":"1st period","period_number":"1"},"odds":{"market":[{"status":"0","id":"190","specifiers":"total=7.5","name":"Bukta, Agnes total games","groups":"all"},{"status":"0","id":"191","specifiers":"total=14.5","name":"Galfi, Dalma total games","groups":"all"},{"favourite":"1","status":"1","id":"198","outcome":[{"id":"70","odds":"2.0","active":"1","name":"odd"},{"id":"72","odds":"1.65","active":"1","name":"even"}],"name":"Odd/even games","groups":"all"},{"favourite":"1","status":"1","id":"199","specifiers":"variant=sr:correct_score:bestof:3","outcome":[{"id":"sr:correct_score:bestof:3:4","active":"0","name":"2:0"},{"id":"sr:correct_score:bestof:3:5","odds":"14.5","active":"1","name":"2:1"},{"id":"sr:correct_score:bestof:3:6","odds":"7.75","active":"1","name":"1:2"},{"id":"sr:correct_score:bestof:3:7","odds":"1.1","active":"1","name":"0:2"}],"name":"Correct score","groups":""},{"favourite":"1","status":"1","id":"192","outcome":[{"id":"74","odds":"5.25","active":"1","name":"yes"},{"id":"76","odds":"1.09","active":"1","name":"no"}],"name":"Bukta, Agnes to win a set","groups":"all"},{"status":"0","id":"191","specifiers":"total=13.5","name":"Galfi, Dalma total games","groups":"all"},{"status":"1","id":"189","specifiers":"total=21.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 21.5"},{"id":"12","odds":"2.3","active":"1","name":"over 21.5"}],"name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"191","specifiers":"total=12.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 12.5"},{"id":"12","odds":"2.35","active":"1","name":"over 12.5"}],"name":"Galfi, Dalma total games","groups":"all"},{"status":"1","id":"190","specifiers":"total=9.5","outcome":[{"id":"13","odds":"1.22","active":"1","name":"under 9.5"},{"id":"12","odds":"3.35","active":"1","name":"over 9.5"}],"name":"Bukta, Agnes total games","groups":"all"},{"favourite":"1","status":"1","id":"195","outcome":[{"id":"74","odds":"3.95","active":"1","name":"yes"},{"id":"76","odds":"1.16","active":"1","name":"no"}],"name":"Will there be a tiebreak","groups":"all"},{"favourite":"1","status":"1","id":"189","specifiers":"total=20.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 20.5"},{"id":"12","odds":"2.3","active":"1","name":"over 20.5"}],"name":"Total games","groups":"all"},{"status":"0","id":"204","specifiers":"setnr=2|total=12.5","name":"2 set - total games","groups":"all"},{"favourite":"1","status":"1","id":"190","specifiers":"total=8.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 8.5"},{"id":"12","odds":"2.3","active":"1","name":"over 8.5"}],"name":"Bukta, Agnes total games","groups":"all"},{"favourite":"1","status":"1","id":"206","specifiers":"setnr=2","outcome":[{"id":"74","odds":"4.05","active":"1","name":"yes"},{"id":"76","odds":"1.16","active":"1","name":"no"}],"name":"2 set - will there be a tiebreak","groups":"all"},{"favourite":"1","status":"0","id":"187","specifiers":"hcp=4.5","name":"Game handicap","groups":"all"},{"favourite":"1","status":"1","id":"186","outcome":[{"id":"4","odds":"8.0","active":"1","name":"Bukta, Agnes"},{"id":"5","odds":"1.02","active":"1","name":"Galfi, Dalma"}],"name":"Winner","groups":"all"},{"favourite":"1","status":"0","id":"203","specifiers":"setnr=2|hcp=2.5","name":"2 set - game handicap","groups":"all"},{"status":"0","id":"187","specifiers":"hcp=3.5","name":"Game handicap","groups":"all"},{"status":"0","id":"204","specifiers":"setnr=2|total=9.5","name":"2 set - total games","groups":"all"},{"status":"1","id":"203","specifiers":"setnr=2|hcp=1.5","outcome":[{"id":"1714","odds":"3.35","active":"1","name":"Bukta, Agnes (1.5)"},{"id":"1715","odds":"1.22","active":"1","name":"Galfi, Dalma (1.5)"}],"name":"2 set - game handicap","groups":"all"},{"status":"0","id":"189","specifiers":"total=22.5","name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"204","specifiers":"setnr=2|total=10.5","outcome":[{"id":"13","odds":"1.45","active":"1","name":"under 10.5"},{"id":"12","odds":"2.3","active":"1","name":"over 10.5"}],"name":"2 set - total games","groups":"all"},{"status":"0","id":"187","specifiers":"hcp=2.5","name":"Game handicap","groups":"all"},{"status":"0","id":"189","specifiers":"total=19.5","name":"Total games","groups":"all"},{"favourite":"1","status":"1","id":"205","specifiers":"setnr=2","outcome":[{"id":"70","odds":"1.95","active":"1","name":"odd"},{"id":"72","odds":"1.65","active":"1","name":"even"}],"name":"2 set - odd/even games","groups":"all"},{"favourite":"1","status":"1","id":"202","specifiers":"setnr=2","outcome":[{"id":"4","odds":"5.25","active":"1","name":"Bukta, Agnes"},{"id":"5","odds":"1.09","active":"1","name":"Galfi, Dalma"}],"name":"2 set - winner","groups":"all"},{"favourite":"1","status":"0","id":"207","specifiers":"setnr=2","name":"2 set - correct score","groups":"all"},{"status":"0","id":"203","specifiers":"setnr=2|hcp=-1.5","name":"2 set - game handicap","groups":"all"}]},"event_fixture":{"_id":"5b572441a7198eb494400815","id":"sr:match:15110315","scheduled":"2018-07-25T10:00:00.000Z","start_time_tbd":false,"status":"live","next_live_time":"2018-07-25T10:10:00.000Z","liveodds":"booked","tournament_round":{"betradar_id":"72404","type":"cup","name":"round_of_16"},"season":{"id":"sr:season:55667","name":"2018 ITF Hungary 07A, Women Singles","start_date":"2018-07-22","end_date":"2018-07-28","year":"2018","tournament_id":"sr:tournament:18282"},"tournament":{"id":"sr:tournament:18282","name":"ITF Hungary 07A, Women Singles","sport":{"id":"sr:sport:5","name":"Tennis"},"category":{"id":"sr:category:213","name":"ITF Women"}},"competitors":{"competitor":[{"id":"sr:competitor:66216","name":"Bukta, Agnes","country":"Hungary","country_code":"HUN","abbreviation":"BUK","qualifier":"home","reference_ids":{"reference_id":{"name":"betradar","value":"5783335"}}},{"id":"sr:competitor:97995","name":"Galfi, Dalma","country":"Hungary","country_code":"HUN","abbreviation":"GAL","qualifier":"away","reference_ids":{"reference_id":{"name":"betradar","value":"6642590"}}}]},"venue":{"id":"sr:venue:31749","name":"Court 6","city_name":"Baja","country_name":"Hungary","country_code":"HUN"},"expireAt":"2018-07-26T10:00:00.000Z"}}} while(n.length < 1000) { n = Object.assign({}, n); }

Run results for: Object.assign vs. JSON String/Parse with large-ish data

Creating a "new" object reference every time

Spread operator

JSON Parse

Object.assign